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ODBC isn't a "database" per se, but a standard interface that can access any database with an ODBC driver.

...and although I'm not familiar with all of the others in that list, the ones that I do recognise have ODBC drivers.

Yes and no. ODBC on Windows may (or may not) be provided by the Microsoft JET driver, which can be considered a database unto itself. Specifically, there is a separate ODBC driver for Go that usql supports, which is what this is reflective of. I actually edited the above after posting to remove a double entry for PostgreSQL and MySQL, as there are two different Go drivers for each of those databases (4 in total) that are well supported by the community.

I read that has the client having specific support for these DB but a fallback to generic ODBC otherwhise

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